Study of grain boundary character along intergranular stress corrosion crack paths in austenitic alloys

Samples of austenitic stainless alloys were examined by means of scanning and transmission electron microscopy. Misorientations were measured by electron backscattered diffraction. Grain boundary distributions were analyzed with special emphasis on the grain boundary character along intergranular st...

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Bibliographic Details
Published in:Acta materialia 2001-05, Vol.49 (9), p.1589-1598
Main Authors: Gertsman, V.Y., Bruemmer, S.M.
Format: Article
Language:English
Subjects:
Applied sciences
AUSTENITIC STEELS
CRACK PROPAGATION
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
GRAIN BOUNDARIES
Grain boundaries, Stress corrosion cracking, Elect
INTERGRANULAR CORROSION
MATERIALS SCIENCE
Metals. Metallurgy
Nickel and iron stainless alloys
Physics
Scanning electron microscopy (SEM)
STRESS CORROSION
Transmission electron microscipy (TEM)
Treatment of materials and its effects on microstructure and properties
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Summary:Samples of austenitic stainless alloys were examined by means of scanning and transmission electron microscopy. Misorientations were measured by electron backscattered diffraction. Grain boundary distributions were analyzed with special emphasis on the grain boundary character along intergranular stress corrosion cracks and at crack arrest points. It was established that only coherent twin Σ3 boundaries could be considered as “special” ones with regard to crack resistance. However, it is possible that twin interactions with random grain boundaries may inhibit crack propagation. The results suggest that other factors besides geometrical ones play an important role in the intergranular stress corrosion cracking of commercial alloys.
ISSN:1359-6454
1873-2453
DOI:10.1016/S1359-6454(01)00064-7